The 20 common amino acids: their NMR spin systems and other useful properties

Select one of the links to go the corresponding amino acid.

One letter codes:

A C D E F G H I K L M N P Q R S T V W Y

Three letter codes:

Ala Cys Asp Glu Phe Gly His Ile Lys Leu
Met Asn Pro Gln Arg Ser Thr Val Trp Tyr

one and three
letter codes
& full names

structures

a proton(s)    b proton(s)

NMR spin
systems

(a)

random
coil
chem. shifts
(b)

side-chain
character-
istics
(c)

pKa
pKb
pKx
(d)
m.w.


(e)
A Ala

Alanine

Ala.gif (1722 bytes)

A3X

NH: 8.15
N
H:122.5

H
a: 4.33
Ca: 52.2
C=O: 177.6

non-polar
aliphatic
2.34
9.69
-
71
C Cys Cysteine

Cys.gif (1877 bytes)

AMX

NH: 8.23
N
H:118.0

H
a: 4.54
Ca: 56.8
C=O: 174.6

polar
uncharged
1.96
8.18
10.28
103
D Asp Aspartic
acid

Asp.gif (1927 bytes)

AMX

NH: 8.37
N
H:120.6

H
a: 4.71
Ca: 53.9
C=O: 176.8

negatively charged 1.88
9.60
3.65
115
E Glu Glutamic
acid

Glu.gif (1975 bytes)

AM
(PT)X

NH: 8.36
N
H:121.3

H
a: 4.33
Ca: 56.3
C=O: 176.6

negatively charged 2.19
9.67
4.25
129
F Phe Phenyl
alanine

Phe.gif (2045 bytes)

AMX
+
AMM'XX'

NH: 8.30
N
H:120.9

H
a: 4.63
Ca: 57.9
C=O: 175.9

aromatic 1.83
9.13
-
147
G Gly Glycine

Gly.gif (1708 bytes)

AX

NH: 8.29
N
H:108.9

H
a: 3.96
Ca: 45.0
C=O: 173.6

non-polar
aliphatic
2.34
9.60
-
57
H His Histidine

His.gif (2027 bytes)

AMX
+
AX

NH: 8.28
N
H:119.1

H
a: 4.60
Ca: 55.5
C=O: 174.9

positively
charged
1.82
9.17
6.00
137
I Ile Isoleucine

Ile.gif (1949 bytes)

A3MP
T(B3)X

NH: 8.21
N
H:123.2

H
a: 4.17
Ca: 61.2
C=O: 176.5

non-polar
aliphatic
2.36
9.60
-
113
K Lys Lysine

Lys.gif (2124 bytes)

A2(F2T2)
MPX

NH: 8.25
N
H:121.5

H
a: 4.33
Ca: 56.4
C=O: 176.5

positively
charged
2.18
8.95
10.53
128
L Leu Leucine

Leu.gif (1954 bytes)

A3B3M
PTX

NH: 8.23
N
H:121.8

H
a: 4.32
Ca: 55.0
C=O: 176.9

non-polar
aliphatic
2.36
9.60
-
113

one and three
letter codes
& full names

structures

a proton(s)    b proton(s)

NMR spin
systems

(a)

random
coil
chem. shifts
(b)

side-chain
character-
istics
(c)

pKa
pKb
pKx
(d)
m.w.


(e)
M Met Methionine

Met.gif (2013 bytes)

AM
(PT)X
+
A3

NH: 8.29
N
H:120.5

H
a: 4.48
Ca: 55.2
C=O: 176.3

polar
uncharged
2.28
9.21
-
131
N Asn Asparagine

Asn.gif (1946 bytes)

AMX

NH: 8.38
N
H:119.5

H
a: 4.74
Ca: 52.7
C=O: 175.6

polar
uncharged
2.02
8.80
-
114
P Pro Proline

Pro.gif (1909 bytes)

A2(T2)
MPX

NH: -
N
H:128.1

H
a: 4.42
Ca: 63.0
C=O: 176.0

non-polar
aliphatic
1.99
10.60
-
97
Q Gln Glutamine

Gln.gif (2034 bytes)

AM
(PT)X

NH: 8.27
N
H:120.3

H
a: 4.33
Ca: 56.0
C=O: 175.6

polar
uncharged
2.17
9.13
-
128
R Arg Arginine

Arg.gif (2187 bytes)

A2(T2)
MPX

NH: 8.27
N
H:120.8

H
a: 4.35
Ca: 56.0
C=O: 176.6

positively
charged
2.17
9.04
12.48
156
S Ser Serine

Ser.gif (1829 bytes)

AMX

NH: 8.31
N
H:116.7

H
a: 4.47
Ca: 58.1
C=O: 174.4

polar
uncharged
2.21
9.15
-
87
T Thr Threonine

Thr.gif (1858 bytes)

A3MX

NH: 8.24
N
H:114.2

H
a: 4.35
Ca: 62.0
C=O: 174.8

polar
uncharged
2.09
9.10
-
101
V Val Valine

Val.gif (1869 bytes)

A3B3MX

NH: 8.19
N
H:121.1

H
a: 4.12
Ca: 62.2
C=O: 176.0

non-polar
aliphatic
2.32
9.62
-
99
W Trp Tryptophan

Trp.gif (2218 bytes)

AMX
+
A(X)MP
+
A

NH: 8.18
N
H:120.5

H
a: 4.66
Ca: 57.6
C=O: 173.6

aromatic  2.83
9.39
-
186
Y Tyr Tyrosine

Tyr.gif (2152 bytes)

AMX
+
AA'XX'

NH: 8.28
N
H:122.0

H
a: 4.55
Ca: 58.0
C=O: 175.9

aromatic 2.20
9.11
10.07
163

one and three
letter codes
& full names

structures

a proton(s)    b proton(s)

NMR spin
systems

(a)

random
coil
chem. shifts
(b)

side-chain
character-
istics
(c)

pKa
pKb
pKx
(d)
m.w.


(e)
(a) from Kurt Wthrich, NMR of Proteins and Nucleic Acids, Wiley & Sons Inc., 1986
(ISBN 0-471-82893-9).
(b) from David S. Wishart and Brian D. Sykes, Methods in Enzymology 239, 363-392 (1994) and publications quoted therein; chemical shifts in ppm: 1H and 13C relative to DSS, 15N relative to NH3; note that the shifts are for amino acids as part of a peptide/protein not as single entities.
(c) from Albert L. Lehninger, David L. Nelson, Michael M. Cox, Principles of Biochemistry,
2nd edition, Worth Publishers, 1997 (ISBN 0-87901-500-4).
(d) Handbook of Chemistry and Physics, 78th edition, 1997-98: pKa and pKb refer to the a-COOH and a-NH3 groups, pKx to the side chain.
(e) incremental m.w. (when amino acid is part of a peptide or protein).

A C D E F G H I K L M N P Q R S T V W Y
Ala Cys Asp Glu Phe Gly His Ile Lys Leu
Met Asn Pro Gln Arg Ser Thr Val Trp Tyr

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